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Finding the Fourth Proportional to 978.72, 1,468.38 and 516.90

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Solution

The fourth proportional to 978.72, 1,468.38 and 516.90 is: 775.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.72 : 1,468.38 = 516.90 : x
  2. Step 2: Convert to fraction form
    978.72/1,468.38 = 516.90/x
  3. Step 3: Cross multiply
    978.72x = 1,468.38 × 516.90
  4. Step 4: Simplify right side
    978.72x = 759,005.62
  5. Step 5: Solve for x
    x = 759,005.62/978.72
  6. Step 6: Final answer
    x = 775.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.